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Hi Fred Have just seen this post, I did test images on Eta Carina a while Back using 1.25 colour filters because I had no 2". The filter wheel was not used just used a adapter to screw each filter into the camera nose piece. I saw no vignetting when the images were stretched. Sorry the images went into the recycle bin. The slim filter wheel positions the filter very close to the ccd chip.
Clear skies Ken
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